本厂主要生产铁路信号电缆，主要是指铁路专用信号电缆，适用于额定电压交流500V或直流1000V及以下传输铁路数字信号、音频信号或自动信号装置的控制电路。
4.铁路信号电缆特性：电缆的使用环境温度为-45～+60℃，敷设的环境温度不低于-10℃。
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Summary: fire-resistant cable refers to the cable which can keep safe running for a certain time under the condition of flame burning. China's national standard GB12666.6 IEC331 (e) will fire test points A, B two levels, A grade flame temperature of 950 ~ 1000 ℃, the duration for fire, 90 min, class B flame temperature of 750 ~ 800 ℃, for fire duration 90 min, during the whole test, the sample should be under the rated voltage value of the product. Fire-resistant cable is widely used in high-rise buildings, subway, underground street, large power stations and the important industrial and mining enterprises and other related to fire security and its lifesaving, for example, fire fighting e and emergency light guide emergency facilities such as power supply circuit and control circuit. Purpose: fireproof cables are widely used in high-rise buildings, subway, underground street, large power stations and the important industrial and mining enterprises and other related to fire security and its lifesaving, for example, fire fighting e and emergency light guide emergency facilities such as power supply circuit and control circuit.
用于以电子计算机为主的自动控制系统,尤其适用于计算机集散控制系统,传递生产装置过程变量的检测、控制、联锁、报警等模拟和数字信号。
塑料绝缘和护套耐火电力电缆适用于大型建筑、石油、冶金、化工、电力、舰船等要求防火安全较高场合的动力装置连接。
HPVHPV20.5HPV线HPVHPYV电缆,HJYVP电缆,HUVVP电缆,MHVV电缆,HUVV32电缆,HYYV电缆,HUVV电缆,HYPV23电缆,HYPV53电缆,HYPV电缆,HYPV22通信电缆等。
不管是接正转还是反转，在接线之前我们都要先分出主线圈和副线圈。
主副线圈判断方法：用万用表测电机三个端子，可以得到三组数值。
其中阻值最小的那一组就是主线圈，阻值最大的一组就是主线圈和副线圈串联的阻值，剩下的一组就是副线圈。
因为主线圈线径比副线圈粗，阻值比副线圈要小。
正转接线方法先把电容接在阻值最大的两个端子上，把火线和零线分别接在主线圈两端即可。
反转接线方法先把电容接在阻值最大的两个端子上，把火线和零线分别接在副线圈两端即可。
3、绝缘电阻见下表：性能聚氯乙烯绝缘交联聚乙烯绝缘体积电阻率ρΩ.㎝20℃时电缆工作温度时-1012绝缘电阻常数KiMΩ.㎞20℃时电缆工作温度时36.70.03673.67■型号名称型号名称铜芯铝芯VV-PYJV-PVLV-PYJLV-P聚氯乙烯(交联聚乙烯)。
产品标准：GB使用条件：电缆导休的长期允许工作温度为70℃；无铠装层的屏蔽电缆，应不小于电缆外径的6倍；有铠装或铜带屏蔽结构的屏蔽电缆，应不小于电缆外径的12倍；有屏蔽层结构的软屏蔽电缆，应小于电缆外径6倍。
Computer cable USES: this product is widely used in electricity, metallurgy, petroleum, chemical industry, textile and other departments of detection and control in a computer system or automated devices, as well as general industrial computer. Features: rated voltage UO/U is 300/500v. Allowed working temperature does not exceed 70 ℃, laying temperature not lower than 0 ℃, allowed bending radius should not less than 12 times of cable outer structure of soft cable should be no less than eight times outside the cable, copper tape screened cable shall be less than 15 times of cable diameter. Product code and significance: dj-electronic computer cable y-polyethylene v-polyvinyl chloride R- represents multiple strands of soft core p-copper wire shielding p2-copper belt shielding P3 aluminum plastic compound
（2）线芯的长期允许工作温度不超过65℃。
（3）W型电缆具有耐气候和一定的耐油性能，适宜于在户外或接触油污的场合使用。
（4）ZR型电缆具有阻燃性能。
用于交流电压450/750V及以下各种移动电器设备，能承受较大的机械外力作用，长期工作温度应不超过65℃，适用于户外或接触油污场合。
Class A system - any phase conductor of such A system can be separated from the system within 1min when it comes into contact with ground or ground conductors. B class system, the system includes only the single-phase earth fault short-time running conditions, earth fault time should be no more than 1 h, but in any case, the longest do not exceed 8 h, ground fault total duration of not more than 125 h every year; Class C systems -- systems that do not belong to class A and class B.
二、产品执行标准Q/AT2003-4三、基本型号及名称型号名称铜芯Cu铝芯ALWFYS-YJYWFYS-YJLY铜芯(铝芯)交联聚乙烯绝缘无毒无害防蚁鼠聚烯烃护套电力电缆WFYS-YJY23WFYS-YJLY23铜芯(铝芯)交联聚乙烯绝缘钢带铠装无毒无害防蚁鼠聚烯烃护套电力电缆WFYS。
(判断题)室外线路沿墙敷设，垂直敷设时，零线设在最下端参考正确2、(判断题)导体的电阻与其材料的电阻率和长度成反比，而与其横截面成正比。
参考错误3、(判断题)再生发电制动只用于电动机转速高于同步转速的场合。
参考正确4、(判断题)IT系统中，安装在木结构或木杆塔上的电气设备的金属外壳一定要保护接地。
参考错误5、(判断题)接地电阻表主要由手摇发电机、电流互感器、电位器以及检流计组成。
性阻抗为100Ω的双绞屏蔽电缆STP-100Ω(forFF&PROFIBUS-PA)onepair18AWG则应用于FF、PROFIBUS-PA总线，常用18AWG导体。
485总线由于其布线简单，稳定可靠从而广泛的应用于视频监控，门禁对讲，楼宇报警等各个领域中，在485总线布线过程中由于有很多不完全准确的概念导致出现很多问题。
HYA22：铜芯实心聚烯烃绝缘挡潮层聚乙烯护套钢带铠装聚氯乙烯护套市内通信电缆。
HYA23：铜芯实心聚烯烃绝缘挡潮层聚乙烯护套钢带铠装聚乙烯护套市内通信电缆。
HYAT22：铜芯实心聚烯烃绝缘填充式挡潮层聚乙烯护套钢带铠装聚氯乙烯护套市内通信电缆。